Valve



Feb. 16 1926.

J. C. MCNAB VALVE Filed August 25, 1924 m \D um a n w C. .m O

lid

Patented Feb. 16,

JOHN C. MCNAB, lOF ROCHESTER, NEWv YORK.

VALVE.

Application med August 25, 1924. seria1 No. 733,979.

To all whom it may concern:

Be it known that I,- JOHN O. MoNAB, a citizen of the United States, residing at Rochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Valves, of which the following is a specification.

The object of this invention is to provide a new and improved .formof valve` for pumps. n

Another object is .to increase theclearance in the valve so as to facilitate the kpassage of water through itl and to increase the efficiency with which the valve operates.

Another object of the invention is to im'- prove the packing of the valve so that it 'willnot leak.

These and other objects of the invention will be fully illustrated in the drawing, described in the specification and pointed out fin the claims thereof.

In the drawings: v

Figure l is a side elevation'of the valve and valve seat.

Figure 3 is a vertical section through the valve showing theV assembly thereof.

In the drawings like reference numerals indicate like parts. f

In the drawing reference numeral l in'- dicates the valve cover having a boss 2 thereon, a rim 3 and a curved web 4, hav-v ing a conoidal shape. Centrally from the web extends up anipple 5 which is threaded to receive the bonnet 6, whichbonnet is provided with a square end 7 by which it may be turned with a wrench. The rim ofV the valve coverisgrooved as is indicated at 8 to receive the annular packing 9.

l() indicates the annular valve seat'having a hub 11 centrally thereof which isconnected thereto by a spider of.v three arms 12-12-12. The hub 1l is threaded to receive the stem 13 which` extends up through Figure 2'is a perspective view of the valve.

The valve is assembled by screwing the are also placed on the stem on top of the cover and the nut 15 4is screwed down to give the desiredpressure. The bonnet 6 is then screwed into place to close the opening between the kvalve cover and the-stem.

l The valve seat, l0 is threaded so that it can be screwed into suitable openings provided in the valve deckV of the pump. Orl

dinarily a series of these valves will be used on the suction side of the pump and another series of the valves will be used on the dis-A charge side of the pump. Y

By placing the hub below the` valve seat and incliningl the armsthat connect it to v the seat the openings through'which the water must pass Aare made considerably larger so thatample clearance is givenfor the passage of the water. By lcurving-the Vweb llthe water is suitably deflected as it` passes up through the valve so'l that it4 passes Vup and out of the valve with the least disturbance and resistance. By the use of the spring the valve is made quick acting and by the use of the bonnet all possibility of leakage or seepage is cut off and the valve can be madeso that the fittings arev loose enough sothat the valve will move 'freely andi will not bind. I claim:v

1. A valve having a seat, a hub located centrally thereof and below andout of linev with the seat, inclined arms connecting said hub to said seat having openings vbetween l.

them, 'a valve stem threadedinto said hub and extending upwardly therefrom, a'cover for said valve havinga conoidal web centrally thereof lengaging with said stemy and an annular groove near the rim thereof adapted to receive a packing which in turn is adapted to engage with said valve seat, said cover having a nipple integral therewith terminatingbelow the top of the seat through Vwhich nipplethe stema' extends, fa bonnet which encloses the valverstem with vthe cov- -Y er, said bonnet imaking a threaded connection with said nipple thereby makingv ak ltight connection with said cover.

2. A valve having a seat, a hub located l. centrally thereof, a valve stemthreaded in to said hub and extending upwardly therefrom, a cover for sa1d valve having a conoidal web making a sliding engagement with said stem, a nipple surroundino said stein forming a part of said @over and extending upwardly therefrom, a spring surrounding said stem and resting upon the nipple be- 5 low, a head on top of said stein which confines said spring from above, a bonnet Inaking threaded connection with said nipple and enclosing the spring and stem, said oonodalweb extending down from the cover and below the valve seat and with the nipple making a long bearing with the stem.

In testimony whereof I alix my signature.

JOHN C. MCNAB. 

